Enabling Large Pages for JBoss EAP

15 minutes
  • 3 Learning Objectives

About this Hands-on Lab

The JBoss Enterprise Application Server allows users to deploy and manage Java applications — and part of this management is making sure our Java apps run smoothly. For memory-intensive applications, this can mean enabling optimization features such as large pages, which locks pages in memory for faster retrieval — albeit at the expense of a non-application performance. In this lab, we enable large pages and ensure there are no memory issues in our application.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Enable Huge Pages via the Kernel

To enable huge pages from the kernel, we can use the sysctl command:

sudo sysctl -w vm.nr_hugepages=1
Enable Large Pages via JBoss EAP
  1. Move into the JBoss EAP home directory:

    cd /opt/jboss-eap/
  1. Open the standalone configuration:

    sudo vim standalone/configuration/standalone.xml
  2. Add the following under extensions:

      <system-properties>
          <property name="JAVA_OPTS" value="-XX:+UseLargePages"/>
      </system-properties>
Restart the Service
  1. Restart JBoss EAP:

    sudo systemctl restart jboss-eap-rhel
  1. Grep the server log for startup warnings:

    cat standalone/log/server.log | grep WARNING

Additional Resources

You are the JBoss EAP administrator for your DevOps team, and recently a particularly memory-intensive application has caused a lot of warnings and memory errors. In an attempt to solve this, you have decided to enable large pages for the standalone server that hosts this application. Configure the large pages, then ensure there are no warnings upon boot.

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